#include <stdio.h>
int g = 0;
int g2 = 1;
int *g0 = &g;
int **g1 = &g0;
int main() {
  for (int i = 0; i <= 3; i++) {
    **g1 = *g0;
    g0 = &g2;
  }
  return g;
}
